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IMO EEXI Calculator

Calculate Attained EEXI vs Required EEXI. IMO MEPC.350(78) reference lines for bulkers, tankers, container ships, LNG carriers, LPG carriers, and general cargo.

MEPC.350(78)
MARPOL Annex VI Reg. 23
EPL simulation

Vessel data

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Ship type
DWT (tonnes)
Main Engine MCR (kW)
SFC Main (g/kWh)
Fuel · Main
Aux Power (kW)
SFC Aux (g/kWh)
Vref (knots @75% MCR)
EPL (Engine Power Limitation)
–
–
–
Attained
–
gCO₂/t·nm
Required
–
gCO₂/t·nm
Margin
–
gCO₂/t·nm

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Reference lines — MEPC.350(78)

Baseline = a × DWT^(−c); Required EEXI = Baseline × (1 − reduction%).

Bulk
20%
a=961.79 c=0.477
Tanker 20-200k
20%
a=1218.8 c=0.488
Tanker >200k
15%
a=1015 c=0.477
Container <40k
15%
a=1219 c=0.489
Container 40-80k
20%
a=174.22 c=0.201
Container >120k
50%
a=174.22 c=0.201
LNG Carrier
30%
special formula
LPG / Gas
30%
a=1120 c=0.456
General Cargo
30%
a=107.48 c=0.216

Frequently asked questions

What is IMO EEXI?
EEXI (Energy Efficiency Existing Ship Index) is a mandatory IMO technical energy-efficiency measure under MARPOL Annex VI Regulation 23. Effective from 1 January 2023. Every ship ≥400 GT must show Attained EEXI ≤ Required EEXI at next IAPP renewal survey.
How is Attained EEXI calculated?
Attained = (P_ME × SFC_ME × CF + P_AE × SFC_AE × CF) / (DWT × Vref × f_c). P_ME is 75% of MCR (or EPL-limited MCR), SFC in g/kWh, CF is fuel carbon factor.
What is EPL?
EPL (Engine Power Limitation) is the most common EEXI compliance solution. Physically limits main engine MCR to a lower value (e.g. 75%). Both P_ME and Vref drop, and Attained EEXI improves proportionally. Class-certified, permanent.